PDF: Font size is rounded

Hi,

The specified font size of scaled TrueType font is rounded
when PDF surface is used. Is it the expected behavior?

Details:

Here is a program that reproduces the behavior:
https://savannah.nongnu.org/bugs/download.php?file_id=36806

Here is the output of the program:
https://savannah.nongnu.org/bugs/download.php?file_id=36804

8.000, 8.125, 8.250 and 8.375 are the same font size.
8.500, ... and 9.375 are the same font size.

It's caused since FreeType 2.4.6. FreeType 2.4.6 includes
the change:
http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=b0962ac34e66052ccfee7996e5468f30d4bd5a72

If I revert the change by
https://savannah.nongnu.org/bugs/download.php?file_id=36807 ,
the program outputs the following PDF:
https://savannah.nongnu.org/bugs/download.php?file_id=36805

In the PDF, 8.000 and 8.125 are the different font size.


I send a question about whether the change is expected or
not to FreeType developers
https://savannah.nongnu.org/bugs/?47582 , a developer said
that it's expected:
https://savannah.nongnu.org/bugs/?47582#comment2

He also said that the use case may be better handled by
high-level library:
https://savannah.nongnu.org/bugs/?47582#comment8

So I send this question to here. Maybe I should send this
question to Pango. Pango also has the same behavior with
PangoCairoFontMap.


Thanks,
--
kou
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